ha-tahoma: Stop command doesn't work for some cover devices

Describe the bug Currently the cover implementation relies on the available commands of a cover device. However, when a stop command is present, it doesn’t mean that the stop command is functional. (thanks Somfy 👍🏻)

https://github.com/iMicknl/ha-tahoma/blob/23eaec1a7f6c9cc776d857ec45bbadca4d206bf0/custom_components/tahoma/cover.py#L217-L221

To Reproduce Steps to reproduce the behavior:

1. Open or close cover
2. Press stop button
3. Cover device doesn’t stop moving

Additional context The integration is not consistent in how it handles a stop command. For example, for the cover_tilt mainly used by Pergolas, we first execute COMMAND_STOP_IDENTIFY since STOP didn’t work for my own device…

https://github.com/iMicknl/ha-tahoma/blob/23eaec1a7f6c9cc776d857ec45bbadca4d206bf0/custom_components/tahoma/cover.py#L223-L227

Best would be to:

First use COMMAND_STOP_IDENTIFY or COMMAND_MY to stop a moving cover. This needs to be thoroughly tested to ensure it doesn’t cause problems with covers that are not experiencing this issue.

OR

Make sure entities can set their preferred stop method via customize.yaml, as a workaround. I am not a fan of having all those device specific if statements in the integration.

Environment (please complete the following information):

• Platform: cover

Device: (if your problem is related to a specific device)

• AwningComponent (io:HorizontalAwningIOComponent) (see #59
• ExteriorScreen (rts:ExteriorBlindRTSComponent) (see #43)